Hi, I would like to use this derailleur in a 1x configuration—meaning without a front derailleur.
I have a couple of questions:
1) Is this feasible, and will the rear derailleur work correctly on its own?
2) Can the button on the left-hand lever be assigned to a different function (for example, acting as a bell, if I'm using an iGPSport BSC500)?

Thank you

Quote from: pedalino on October 29, 2026, 11:28:26 AMHi, I would like to use this derailleur in a 1x configuration—meaning without a front derailleur.
I have a couple of questions:
1) Is this feasible, and will the rear derailleur work correctly on its own?
2) Can the button on the left-hand lever be assigned to a different function (for example, acting as a bell, if I'm using an iGPSport BSC500)?

Thank you

Any reason why you'd prefer the EDS TX RD over the GEX RD instead since that one is made for 1x?

Weight?

Quote from: Ludo on October 29, 2026, 12:25:01 PMWeight?

How big is the weight difference? Carbon shifters are available for GEX, plus the GEX RD has more cage size options.

Quote from: jonathanf2 on October 29, 2026, 11:49:32 AMAny reason why you'd prefer the EDS TX RD over the GEX RD instead since that one is made for 1x?

because i'm not confident about 1x configuration. the total weight, considering the chainring and cassette, is the same.

Quote from: pedalino on October 29, 2026, 05:56:02 PMbecause i'm not confident about 1x configuration. the total weight, considering the chainring and cassette, is the same.

I think you can run EDS TX without the FD. I've seen some vendors just selling the groupset without the front derailleur. I'm not sure about button configuration though.

You could buy the complete groupset and then "not pair" the FD to the system, or you could not install the FD so you can run the 1x.
And in case it is not what you wanted, and need 2x, you can buy a 2x chainring and use the complete groupset.
Of course it is not cheap. But it´s a solution
Just my 2 cents

Quote from: pedalino on October 29, 2026, 11:28:26 AMHi, I would like to use this derailleur in a 1x configuration—meaning without a front derailleur.
I have a couple of questions:
1) Is this feasible, and will the rear derailleur work correctly on its own?
2) Can the button on the left-hand lever be assigned to a different function (for example, acting as a bell, if I'm using an iGPSport BSC500)?

Thank you

If you dont pair the FD the RD will work with all the cogs of the cassette (I tried it). So with correct chain length I think it will work

Quote from: ricchirock on October 30, 2026, 06:42:03 AMIf you dont pair the FD the RD will work with all the cogs of the cassette (I tried it). So with correct chain length I think it will work

I confirm by answering myself. It is feasible and it is written in the FAQ of Wheeltop where is indicated also the procedure.

I came to this conclusion: the overall weight difference between a 2x and a 1x setup is practically nil, while 12-speed components are significantly cheaper and offer a much wider variety of options. So, I went with that (from Arancee). Later on, once 14-speed components become widely available, I'll consider switching to a 1x setup.